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LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279

KNOWLEDGE BASE

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Service Instructions | 08.24.18
Service Instruction No. 1571

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5

Service Letters | 08.24.18
Service Letter No. 247 J

Shelf Life Requirements

Service Bulletins | 08.24.18
Service Bulletin No. 301 B

Maintenance Procedures and Service Limitations for Valves

Service Instructions | 08.02.18
Service Instruction No. 1572

Plug Replacement of Vapor Return Fitting on Piper installation of IO-360- B4A

Service Instructions | 08.02.18
Service Instruction No. 1570 A

Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System

Service Bulletins | 05.16.18
Service Bulletin No. 627 E

Exhaust System Inspection

Service Letters | 05.16.18
Service Letter No. 275 A

Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB627

Parts Catalog | 04.30.18
HIO-390-A1A Illustrated Parts Catalog

DOCUMENT PART NO. PC-HIO-390-A1A

Parts Catalog | 04.24.18
AEIO-540-L1B5 Parts Catalog

Document Part No. PC-615-9

Service Letters | 04.15.18
Service Letter No. 253 C

Warranty Repair of AVStar Fuel Systems, Inc. Fuel Control Products

Parts Catalog | 04.12.18
AEIO-540-L1B5D Parts Catalog

Document Part No. PC-615-7

Service Bulletins | 02.26.18
Supplement No. 7 to Service Bulletin No. 342 G

FUEL LINE (STAINLESS STEEL TUBE ASSY.) AND SUPPORT CLAMP INSPECTION AND INSTALLATION SUPPLEMENT NO. 7

Service Bulletins | 02.09.18
Service Bulletin No. 553

Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines

Service Bulletins | 02.09.18
Service Bulletin No. 549

Engine/Crankshaft Inspection

Parts Catalog | 02.09.18
IO-360-B1G6 Parts Catalog

Document Part No. PC-306-13

Parts Catalog | 02.09.18
O-360-C4F & -C4P Parts Catalog

Document Part No. PC-306-8

Service Instructions | 02.09.18
Service Instruction No. 1241 C

Pre-Oiling Engine Prior to Initial Start

Service Instructions | 02.09.18
Service Instruction No. 1094 D 

Fuel Mixture Leaning Procedures

Parts Catalog | 02.09.18
O-540 (WFC) Parts Catalog

Document Part No. PC-515

Service Bulletins | 02.09.18
Service Bulletin No. 482

Crankshaft Flange Area Cracking

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Lycoming Engines is an Operating Division of Avco Corporation. ©2025 Avco Corporation.

LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279